Calculate the vertical shear stress (N / cm2) at point A in the critical section of the beam below whose load and section is given? The cross section is symmetrical with respect to the y-axis. (Point A is on the body, point B is on the x-axis and point C is on the header.) (Q = 6000 N / m, P = 60000 N, L = 3 m, b = 50 cm t = 5 cm, h = 20 cm)
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